Sewing device with a sewing head including a rotary housing

Abstract

A sewing device with a sewing head and a feeding device for generating a two-axis-relative motion of a constant velocity between a workpiece to be stitched wherein the sewing head has a rotary housing pivoted about an axis of rotation at the sewing head. In the housing, a needle bar including a needle is pivoted and the needle bar essentially extends about the axis of rotation. The housing further has a common drive for a thread take-up means and a crank including a jogging gear, wherein the two latter cooperate to produce a needle feed movement. The rotary housing is rotatably controlled together with a bearing bracket including a hook, in order to render possible sewing of a stitch contour, wherein the needle feed movement is tangentially guided relative to the individual sewing direction. The drive connection between the main drive shaft and the drive elements incorporated in the rotary housing are constructed of a double timing belt pulley concentrically pivoted with respect to the axis of rotation. The upper part of the double timing belt pulley is drivingly connected to the main drive shaft by a timing belt, the lower part of the double timing belt pulley transmits the drive movement to the crank mechanism for reciprocatingly driving the needle bar.